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The last link mentioned by SGPJ is mine.
First of all it's Two Node Neutron OVS&GRE Havana Fedora 20 Cluster. Actually I have to support 3 Networks. 1. External 2. Management 3. Data/VM So Controller+Neutron Server should have at least 2 ( better 3 ) NICs, Compute should have 2 NICs. Yes , it's possible to use one NIC for each one of mentioned networks, but only in case of low load. Heavy network loaded clusters environment does require (2-3)+(2)

The last link mentioned by SGPJ is mine. 
First of all it's Two Node Neutron OVS&GRE Havana Fedora 20 Cluster. Actually I have to support 3 Networks. 1. External 2. Management 3. Data/VM So Controller+Neutron Server should have at least 2 ( better 3 ) NICs, Compute should have 2 NICs. Yes , it's possible to use one NIC for each one of mentioned networks, but only in case of low load. Heavy network loaded clusters environment does require (2-3)+(2)

(2-3)+(2)